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JEE Main 202622 JanuaryEvening Shift
Exam
JEE Main
Year
2026
Date
22 January
Shift
Evening Shift
Subject
Physics
Chapter
Ray Optics

JEE Main 2026 · 22 January · Evening Shift · Physics · Ray Optics

The wavelength of light, while it is passing through water is 540...

The wavelength of light, while it is passing through water is 540 nm. The refractive index of water is 4/34 / 3. The wavelength of the same light when it is passing through a transparent medium having refractive index of 3/23 / 2 is ____\_\_\_\_ nm.

Options

  1. A540
  2. B480
  3. C840
  4. D380

Correct answer

B. 480

Step-by-step solution

Frequency of light is constant in all media.
In water with refractive index 4/34/3, wavelength is 540 nm.
The wavelength in vacuum is λ0=540×43=720\lambda_0 = 540 \times \frac{4}{3} = 720 nm.
In a medium with refractive index 3/23/2, the wavelength is λ=7203/2=720×23=480\lambda = \frac{720}{3/2} = 720 \times \frac{2}{3} = 480 nm.
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